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I find the code below , but I can’t understand this.
if (!-[1, ] && !window.XMLHttpRequest) {
document.execCommand("BackgroundImageCache", false, true);
}
What does if(!-[1,]) mean ? Thanks
It’s a hack to detect old Internet Explorer.
-[1,]is-1in modern browsers (sofalsewith!) butNaNin old IE (truenegated). The first version to return correct result is IE9.